Truck side frame



G. G. FLOYD.

TRUCK SIDE FRAME. APPLICATION FILED 1mm. 1920.

Patented May 24,1921.

'IIIIIIII! |Il l l llu u l the same 1 ticularly pointed out in GEORGE G. FLOYD, OF CHICAGO,

ILLINOIS, ASSIGNOR TO AMERICAN STEEL IEOUNDRIES,

OF CHICAGO, ILLINOIS, A CORPORATION OF NEW JERSEY.

TRUCK SIDE FRAME.

Application filed March 4,

To all whom it may concern:

Be it known that I, GEORGE G. FLoYD, a citizen of the United States, residing'at .Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Truck Side Frames, of which the following is a specification.

This invention relates to cast metal truck side frames.

In my copending application, Serial No. 344,769, filed December 15, 1919, I have set forth at great length the causes and effects of compression, tension and bending stresses set up in a cast metal frame, and which are peculiar to the cast type ofside frame. such case, I disclosed a cast metal side frame having pedestal jaws for receiving separate journal boxes.

This present application relates more specifically to a cast metal truck side frame in which the journal boxes are formed integrally with the side frame. Otherwise, the conditions are the same inboth cases. Norepetitionwill bemade in this application of the subject matter claimed in said copending application, and only such points as are necessaryto give, a complete understanding of thispresent invention will be considered.

' The object of this invention is to provide a cast metal truck side frame in which the tendency for the integrally formed boxes to swing downwardly and longitudinally inwardly is substantially overcome.

This and other objects are accomplished by means of the arrangement disclosed-on the accompanying sheet of drawings, in which- Figure 1 is a fragmentary side elevation of my improved truck side frame, some of the parts being in section;

Fig. 2 is a fragmentary top plan view of Fig. 3 is an e frame; and

'Fig. 4 is a side elevation, somewhat diagrammatic in form, of a well known'type of truck side frame, in which the journal boxes d view of the same side form integral parts of the side frame.

The various novel features of the invention will be apparent from the following description anddrawings, and will be parthe appended claims.

Attention is directed first to Fig. 4 of the Specification of Letters Patent.

journal box 14;

Patented May 24, 1921.

1920. Serial No. 363,118.

drawings, wherein it will be noted that I have shown a truck side frame 10, having a tension member 11, compression member 12, columns 13, and journal boxes 14:, cast integrally in a single piece. It will be noted that the tension and compression members 11 and 12 are not connected directly to each other at their outer ends, but are connected by a metal portion 15, which lies just 1n- .wardly from the inner side of the journal box 14. From this figure it is apparent that if the tension and compression members were projected in straight lines outwardly, they would meet at a point substantially in the middle of the journal box; in other words, at a point in space.

Under these conditions, it is apparent that if the truck side frame is loaded in the usual manner, acompressive force will act outwardly in the direction of the arrow C, and a tension force will act inwardly in the direction of the arrow T. As a result of these two forces acting in different directions, which are substantially opposite to each other, a longitudinal shearing action is set up in the line S- S of metal section 15.

A further effect, and probably more serious one. is the actual swinging effect given to the journal boxes, this swinging action being downwardly and longitudinally .inwardly. To overcome in part this swinging effect of the integrally formed journal boxes, a reinforcing fin 16 is formed on the compression member and extended over the In actual operation, it was found that while the reinforcing fin 16 may have been of'some value, fractures appeared in the reinforcing fin 16 over the journal boxes 14 and slightly inwardly therefrom, resulting in a further bending or swinging action of the journal boxes in the manner hereinabo-ve mentioned. In many cases the fractures extended to such degree that the side frames failed.

This problem is one which ispeculiar to the cast type of side frame having the integrally formed journal boxes, and it is to .overcome this objectionable feature that I have designed the side frame disclosed in Figs. 1, 2 and 3 of the drawings.

Referring now to these figures, it will be noted that the cast metal side frame includes a tension member 17, compression member 18, columns 19 (only one of which is shown) and journal boxes 20 (only one of which is shown), all cast in a single piece. Prefer-- ably, the tension'and compression members are of channel section, with their webs 21. and 22 located at the upper side of each of the compression stresses in the compression member 18, and tension stresses in the tension member 21, do not act toswing the integrally formed journal boxes 20 downwardly and longitudinally inwardly. The web members 21 and 22 outwardly from the columns 19 extend in straight lines and carry the compression and tension stresses primarily along said lines.

As set forth in my said copending application, the web portion 21 of the tension member is located at the upper side of the tension member to overcome certain high bending and tension stresses which are peculiar to the cast metal type of side frame.

By means of this same arrangement, and

connecting the tension and compression members in the manner shown with respect to each other, and with respect to the integrally formed journal boxes, I have overcome the tendency for the journal boxes to swing downwardly and longitudinally inwardly. By means of this arrangement, any shearing action or fracturing action above and to the sides of the journal boxes .is overcome. It will be noted that the main tension stresses transmitted through the tension member 17 are transmitted directly to the compression member and are not passed through the journal box structure proper.

By means of the combination of parts hereinabove described, the tendency 'of the box to revolve on the journal is eliminated, the point of connection between the compression and tension members being approximately over the middle of the journal box or point of support.

It is my intention to cover all modifications of the invention as set forth in the following claims.

I claim:

1. A truck side frame including tension and compression members and journal boxes all cast in a single piece, the tension and compression members being of channel section with the webs thereof at theupper side of each of said members respectively, and being joined directly to each other over the middle of the journal box to prevent downwardly and longitudinally inwardly'swinging movement of the journal boxes.

2. A truck side frame including tension and compression-members and journal boxes all cast in a single piece, the tension member being of channel section and having its web at the upper side thereof, and joined directly to the compression member over the middle of the journal box to prevent tendency of the journal box to revolve.

3.. A truck side frame including tension and compression members and entire journal boxes all cast in a single piece, said tension and compression members being directly connected to each other over the journal box to prevent tendency of said journal box to revolve.

Signed at Chicago, Illinois, this 28th day of February, 1920.

GEORGE G. FLOYD. 

